JP6477270B2 - パターン形成方法 - Google Patents
パターン形成方法 Download PDFInfo
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- JP6477270B2 JP6477270B2 JP2015116739A JP2015116739A JP6477270B2 JP 6477270 B2 JP6477270 B2 JP 6477270B2 JP 2015116739 A JP2015116739 A JP 2015116739A JP 2015116739 A JP2015116739 A JP 2015116739A JP 6477270 B2 JP6477270 B2 JP 6477270B2
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Classifications
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F220/387—Esters containing sulfur and containing nitrogen and oxygen
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
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- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2053—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a laser
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70033—Production of exposure light, i.e. light sources by plasma extreme ultraviolet [EUV] sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
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Description
1.フッ素原子含有ポリマー、酸によってアルカリ溶解性が向上又は低下するベース樹脂、酸発生剤及び有機溶剤を含むレジスト組成物を塗布する工程、
大気圧下の沸点が60〜250℃である溶剤雰囲気下で、50〜300℃の温度でベークする工程、
露光する工程、及び
現像する工程
を、この順で含むパターン形成方法。
2.溶剤雰囲気下のベークによって、前記フッ素原子含有ポリマーがレジスト膜表面を覆う、1のパターン形成方法。
3.前記大気圧下の沸点が60〜250℃である溶剤が、炭素数4〜10のエステル系溶剤、炭素数5〜10のケトン系溶剤、炭素数8〜12のエーテル系溶剤、炭素数7〜12の芳香族系溶剤又は炭素数4〜8のアミド系溶剤である1又は2のパターン形成方法。
4.前記炭素数4〜10のエステル系溶剤が、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、プロピレングリコールモノプロピルエーテルアセテート、プロピレングリコールモノブチルエーテルアセテート、プロピレングリコールモノ−t−ブチルエーテルアセテート、ピルビン酸エチル、3−メトキシプロピオン酸メチル、3−エトキシプロピオン酸メチル、3−メトキシプロピオン酸エチル、3−エトキシプロピオン酸エチル、酢酸t−ブチル、プロピオン酸t−ブチル、酢酸プロピル、酢酸ブチル、酢酸イソブチル、酢酸ペンチル、酢酸ブテニル、酢酸イソペンチル、ギ酸プロピル、ギ酸ブチル、ギ酸イソブチル、ギ酸ペンチル、ギ酸イソペンチル、吉草酸メチル、ペンテン酸メチル、クロトン酸メチル、クロトン酸エチル、プロピオン酸メチル、プロピオン酸エチル、3−エトキシプロピオン酸エチル、乳酸メチル、乳酸エチル、乳酸プロピル、乳酸ブチル、乳酸イソブチル、乳酸ペンチル、乳酸イソペンチル、2−ヒドロキシイソ酪酸メチル、2−ヒドロキシイソ酪酸エチル、安息香酸メチル、安息香酸エチル、酢酸フェニル、酢酸ベンジル、フェニル酢酸メチル、ギ酸ベンジル、ギ酸フェニルエチル、3−フェニルプロピオン酸メチル、プロピオン酸ベンジル、フェニル酢酸エチル又は酢酸2−フェニルエチルであり、炭素数5〜10のケトン系溶剤が、2−オクタノン、2−ノナノン、2−ヘプタノン、3−ヘプタノン、4−ヘプタノン、2−ヘキサノン、3−ヘキサノン、ジイソブチルケトン、メチルシクロヘキサノン、アセトフェノン、メチルアセトフェノン、シクロペンタノン、シクロヘキサノン、シクロオクタノン又はメチル−2−n−ペンチルケトンであり、炭素数8〜12のエーテル系溶剤が、ジ−n−ブチルエーテル、ジイソブチルエーテル、ジ−s−ブチルエーテル、ジ−n−ペンチルエーテル、ジイソペンチルエーテル、ジ−s−ペンチルエーテル、ジ−t−ペンチルエーテル又はジ−n−ヘキシルエーテルであり、炭素数7〜12の芳香族系溶剤が、トルエン、キシレン、エチルベンゼン、イソプロピルベンゼン、t−ブチルベンゼン又はメシチレンであり、炭素数4〜8のアミド系溶剤が、N,N−ジメチルアセトアミド、N,N−ジエチルアセトアミド、N,N−ジメチルプロピオンアミド、N−エチルプロピオンアミド又はピバルアミドである3のパターン形成方法。
5.前記フッ素原子含有ポリマーが、α−トリフルオロメチルヒドロキシ基又はフルオロスルホンアミド基を含み、アルカリ現像液に溶解するものである1〜4のいずれかのパターン形成方法。
6.前記フッ素原子含有ポリマーが、下記式(1)で表される繰り返し単位及び/又は下記式(2)で表される繰り返し単位を含む5のパターン形成方法。
7.波長248nmのKrFエキシマレーザー、波長193nmのArFエキシマレーザー、波長3〜15nmの極端紫外光、又は電子線を用いて露光を行う1〜6のいずれかのパターン形成方法。
8.露光が、ArFエキシマレーザーによる液浸リソグラフィーである7のパターン形成方法。
9.前記ベース樹脂が、下記式(7)で表される繰り返し単位及び/又は下記式(8)で表される繰り返し単位を含む1〜8のいずれかのパターン形成方法。
10.前記ベース樹脂100質量部に対して、前記フッ素原子含有ポリマーが0.1〜15質量部の範囲で添加されている1〜9のいずれかのパターン形成方法。
[フッ素原子含有ポリマー]
前記フッ素原子含有ポリマーとしては、下記式(1)で表されるα−トリフルオロメチルアルコール基を含む繰り返し単位(以下、繰り返し単位a1という)及び/又は下記式(2)で表されるフルオロスルホンアミド基を含む繰り返し単位(以下、繰り返し単位a2という)を含むものが好ましい。
本発明のパターン形成方法に用いるレジスト組成物に含まれるベース樹脂は、下記式(7)で表される繰り返し単位(以下、繰り返し単位d1という)及び/又は下記式(8)で表される繰り返し単位(以下、繰り返し単位d2という)を含むことが好ましい。
前記有機溶剤としては、前記各成分を溶解可能なものであれば特に限定されない。このような有機溶剤としては、例えば、特開2008−111103号公報の段落[0144]〜[0145]に記載のシクロヘキサノン、メチル−2−n−ペンチルケトン等のケトン類;3−メトキシブタノール、3−メチル−3−メトキシブタノール、1−メトキシ−2−プロパノール、1−エトキシ−2−プロパノール等のアルコール類;プロピレングリコールモノメチルエーテル、エチレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、エチレングリコールモノエチルエーテル、プロピレングリコールジメチルエーテル、ジエチレングリコールジメチルエーテル等のエーテル類;プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、乳酸エチル、ピルビン酸エチル、酢酸ブチル、3−メトキシプロピオン酸メチル、3−エトキシプロピオン酸エチル、酢酸t−ブチル、プロピオン酸t−ブチル、プロピレングリコールモノt−ブチルエーテルアセテート等のエステル類;γ−ブチロラクトン等のラクトン類、及びこれらの混合溶剤が挙げられる。アセタール系の酸不安定基を用いる場合は、アセタールの脱保護反応を加速させるために高沸点のアルコール系溶剤、具体的にはジエチレングリコール、プロピレングリコール、グリセリン、1,4−ブタンジオール、1,3−ブタンジオール等を加えることもできる。
本発明のパターン形成方法に用いられるレジスト組成物には、前記フッ素原子含有ポリマー、前記ベース樹脂、酸発生剤及び有機溶剤のほかに、更に塩基性化合物、界面活性剤、溶解制御剤、アセチレンアルコール類等を目的に応じて適宜組み合わせて配合してもよい。
本発明のパターン形成方法は、基板上に、前記レジスト組成物を塗布する工程、大気圧下の沸点が60〜250℃である溶剤雰囲気下で、50〜300℃の温度でベークする工程、露光する工程、及び現像する工程を含む。
[調製例1〜5]
下記ベース樹脂、フッ素原子含有ポリマー、酸発生剤(PAG)、クエンチャー、界面活性剤及び溶剤を、表1記載の組成に従って混合し、0.2μmのポアサイズのポリエチレン製フィルターでろ過してレジスト組成物を調製した。
[実施例1−1〜1−8、比較例1−1〜1−2]
東京エレクトロン(株)製クリーントラックACT-8を用いて調製例1〜5で調製したレジスト組成物を各々スピンコート法によってシリコン基板上に塗布し、同装置のバブリング装置を用いて表2記載の溶剤をバブリングさせながら、表2記載の温度で60秒間プリベークし、厚さ90nmのレジスト膜を作製した。
[実施例2−1〜2−8、比較例2−1〜2−2]
シリコンウエハーに信越化学工業(株)製スピンオンカーボン膜ODL-102を200nm、その上に信越化学工業(株)製ケイ素含有スピンオンハードマスクSHB-A940を35nmの膜厚で成膜したトライレイヤープロセス用の基板上に、東京エレクトロン(株)製クリーントラックACT-8を用いて調製例1〜5で調製したレジスト組成物を各々スピンコート法によって塗布し、同装置のバブリング装置を用いて表3記載の溶剤をバブリングさせながら60秒間プリベークし、ホットプレートを用いて100℃で60秒間ベークし、厚さ90nmのレジスト膜を作製した。
これをArFエキシマレーザー液浸スキャナー((株)ニコン製、NSR-610C、NA1.30、σ0.98/0.78、ダイポール開口20度、Azimuthally偏光照明、6%ハーフトーン位相シフトマスク)を用いて露光量を変化させながら露光を行った。露光後、表3記載の温度で60秒間PEBし、2.38質量%のテトラメチルアンモニウムヒドロキシド水溶液で30秒間パドル現像して40nmラインアンドスペースパターンを形成した。現像後のLWRを、測長SEM((株)日立製作所製CG-4000)で測定した。結果を表3に示す。
Claims (10)
- フッ素原子含有ポリマー、酸によってアルカリ溶解性が向上又は低下するベース樹脂、酸発生剤及び有機溶剤を含むレジスト組成物を塗布する工程、
大気圧下の沸点が60〜250℃である溶剤雰囲気下で、50〜300℃の温度でベークする工程、
露光する工程、及び
現像する工程
を、この順で含むパターン形成方法。 - 溶剤雰囲気下のベークによって、前記フッ素原子含有ポリマーがレジスト膜表面を覆う、請求項1記載のパターン形成方法。
- 前記大気圧下の沸点が60〜250℃である溶剤が、炭素数4〜10のエステル系溶剤、炭素数5〜10のケトン系溶剤、炭素数8〜12のエーテル系溶剤、炭素数7〜12の芳香族系溶剤又は炭素数4〜8のアミド系溶剤である請求項1又は2記載のパターン形成方法。
- 前記炭素数4〜10のエステル系溶剤が、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、プロピレングリコールモノプロピルエーテルアセテート、プロピレングリコールモノブチルエーテルアセテート、プロピレングリコールモノ−t−ブチルエーテルアセテート、ピルビン酸エチル、3−メトキシプロピオン酸メチル、3−エトキシプロピオン酸メチル、3−メトキシプロピオン酸エチル、3−エトキシプロピオン酸エチル、酢酸t−ブチル、プロピオン酸t−ブチル、酢酸プロピル、酢酸ブチル、酢酸イソブチル、酢酸ペンチル、酢酸ブテニル、酢酸イソペンチル、ギ酸プロピル、ギ酸ブチル、ギ酸イソブチル、ギ酸ペンチル、ギ酸イソペンチル、吉草酸メチル、ペンテン酸メチル、クロトン酸メチル、クロトン酸エチル、プロピオン酸メチル、プロピオン酸エチル、3−エトキシプロピオン酸エチル、乳酸メチル、乳酸エチル、乳酸プロピル、乳酸ブチル、乳酸イソブチル、乳酸ペンチル、乳酸イソペンチル、2−ヒドロキシイソ酪酸メチル、2−ヒドロキシイソ酪酸エチル、安息香酸メチル、安息香酸エチル、酢酸フェニル、酢酸ベンジル、フェニル酢酸メチル、ギ酸ベンジル、ギ酸フェニルエチル、3−フェニルプロピオン酸メチル、プロピオン酸ベンジル、フェニル酢酸エチル又は酢酸2−フェニルエチルであり、炭素数5〜10のケトン系溶剤が、2−オクタノン、2−ノナノン、2−ヘプタノン、3−ヘプタノン、4−ヘプタノン、2−ヘキサノン、3−ヘキサノン、ジイソブチルケトン、メチルシクロヘキサノン、アセトフェノン、メチルアセトフェノン、シクロペンタノン、シクロヘキサノン、シクロオクタノン又はメチル−2−n−ペンチルケトンであり、炭素数8〜12のエーテル系溶剤が、ジ−n−ブチルエーテル、ジイソブチルエーテル、ジ−s−ブチルエーテル、ジ−n−ペンチルエーテル、ジイソペンチルエーテル、ジ−s−ペンチルエーテル、ジ−t−ペンチルエーテル又はジ−n−ヘキシルエーテルであり、炭素数7〜12の芳香族系溶剤が、トルエン、キシレン、エチルベンゼン、イソプロピルベンゼン、t−ブチルベンゼン又はメシチレンであり、炭素数4〜8のアミド系溶剤が、N,N−ジメチルアセトアミド、N,N−ジエチルアセトアミド、N,N−ジメチルプロピオンアミド、N−エチルプロピオンアミド又はピバルアミドである請求項3記載のパターン形成方法。
- 前記フッ素原子含有ポリマーが、α−トリフルオロメチルヒドロキシ基又はフルオロスルホンアミド基を含み、アルカリ現像液に溶解するものである請求項1〜4のいずれか1項記載のパターン形成方法。
- 前記フッ素原子含有ポリマーが、下記式(1)で表される繰り返し単位及び/又は下記式(2)で表される繰り返し単位を含む請求項5記載のパターン形成方法。
- 波長248nmのKrFエキシマレーザー、波長193nmのArFエキシマレーザー、波長3〜15nmの極端紫外光、又は電子線を用いて露光を行う請求項1〜6のいずれか1項記載のパターン形成方法。
- 露光が、ArFエキシマレーザーによる液浸リソグラフィーである請求項7記載のパターン形成方法。
- 前記ベース樹脂が、下記式(7)で表される繰り返し単位及び/又は下記式(8)で表される繰り返し単位を含む請求項1〜8のいずれか1項記載のパターン形成方法。
- 前記ベース樹脂100質量部に対して、前記フッ素原子含有ポリマーが0.1〜15質量部の範囲で添加されている請求項1〜9のいずれか1項記載のパターン形成方法。
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